배기 재순환 조건에서 n-heptane/n-butnaol 혼합연료의 혼합비율 변화에 따른 착화지연에 관한 연구

This study was conducted to observe the ignition delay time using a rapid compression machine (RCM). It also adapted high exhaust gas recirculation (EGR) rate by 9-10% O2 condition which is expected to lead low temperature combustion that result in decreasing NOx and soot emission. The experiments were performed using binary fuel of n-heptane and n-butanol so that the combustion characteristics of binary fuel were observed with changing the blending ratio. In addition, simulation of the ignition delay time was performed using CHEMKIN code to validate the experimental results and predict the chemical species after combustion process. Experiments showed that the ignition delay increased with increasing the n-butanol ratio in the mixture due to a decrease of oxidation of n-heptane at the low temperature. Moreover, all of the binary fuel mixtures indicated clear cool flame behavior at low temperature and negative-temperature -coefficient (NTC) behavior which is a characteristics of n-heptane as well.